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Question 7 Discussion
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Selected Answers: B
A LAG combines multiple links that terminate on the same switch. Although LAGs provide higher bandwidth and redundancy, the fact that all links terminate on the same switch still makes the LAG susceptible to a single point of failure. This is, if you lose the switch, you also lose all your links. MCLAG overcomes this limitation by enabling you to form a LAG with links that terminate on two different switches. Adjacent network devices see the two switches as a single switch. The most basic MCLAG deployment involves two switches and a client, such as FortiGate.
The switches are connected through a LAG of one or more links to form an MCLAG peer group. The LAG that connects the switches is called the inter-chassis link (ICL), and is used to forward user traffic, as well as to exchange control information about the MCLAG. The client is configured with two links; each connected to a different switch. The switches work together, so the LAG on the client operates like a regular LAG despite its links terminating on different switches.
The result is that, if a link or a switch is lost, the switches coordinate with each other to ensure that the user traffic continues to be forwarded through the remaining active links. All FortiSwitch models, except the ones indicated on this slide, support MCLAG. MCLAG is a vendor-specific implementation, and in the case of FortiSwitch, it has the following requirements: . The switches where the links terminate must be configured as MCLAG peers. . Two switches form an MCLAG peer group. The switches in the MCLAG peer group must have the same hardware model and software version. . mclag-stp-aware must be enabled globally on FortiSwitch, and STP must be enabled on the ICL trunk. Both settings are enabled by default.
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A FortiGate is connected to a pair of FortiSwitch devices. For redundancy, FortiGate must use uplinks on both switches simultaneously without depending on Spanning Tree Protocol (STP). Which configuration is required? (Choose one answer)
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